found and fixed a couple of issues/bugs...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

ui/ImageGrid.js

@@ -383,18 +383,18 @@ function nextImage(n, mode){
 		mode = NAV_DEFAULT
 	}
 	n = n == null ? 1 : n
-	return centerImage(
+	var target = $('.current.image').nextAll('.image' + mode)
-		focusImage(
+	target = target.length < n ?  target.last() : target.eq(n-1)
-			$('.current.image').nextAll('.image' + mode).eq(n-1)))
+	return centerImage(focusImage(target))
 }
 function prevImage(n, mode){
 	if(mode == null){
 		mode = NAV_DEFAULT
 	}
 	n = n == null ? 1 : n
-	return centerImage(
+	var target = $('.current.image').prevAll('.image' + mode)
-		focusImage(
+	target = target.length < n ? target.last() : target.eq(n-1)
-			$('.current.image').prevAll('.image' + mode).eq(n-1)))
+	return centerImage(focusImage(target))
 }
 function nextScreenImages(mode){
 	return nextImage(Math.round(getScreenWidthInImages()), mode)

ui/keybindings3.js

@@ -146,26 +146,26 @@ var KEYBOARD_CONFIG = {
 				// NOTE: marking does not change move direction...
 				default: function(){ 
 					toggleImageMark()
-					if($('.current.image').filter(':visible').length == 0){
-						centerImage(focusImage(getImageBefore()), 'css')
-					}
 					if(DIRECTION == 'next'){
 						nextImage()
 					} else {
 						prevImage()
 					}
+					if($('.current.image').filter(':visible').length == 0){
+						centerImage(focusImage(getImageBefore()))
+					}
 				},
 				// same as default but in reverse direction...
 				shift: function(){
 					toggleImageMark()
-					if($('.current.image').filter(':visible').length == 0){
-						centerImage(focusImage(getImageBefore()), 'css')
-					} 
 					if(DIRECTION == 'prev'){
 						nextImage()
 					} else {
 						prevImage()
 					}
+					if($('.current.image').filter(':visible').length == 0){
+						centerImage(focusImage(getImageBefore()))
+					} 
 				},
 				ctrl: function(){ 
 					var action = toggleImageMark()